NEW Energizer® EZ Turn & Lock. Our longest lasting zero mercury hearing aid batteries ever*. EZ Turn & Lock design keeps unused batteries safe and secure Batteries are easily removable from the access tab on the back - but only when you WANT to remove them. You are in control with the Energizer EZ Turn & Lock package. This easy, convenient packaging keeps your hearing aid batteries secure. The dial is easy to turn, yet the lock and the click lets you turn the batteries and know they are precisely where they need to be to dispense - or stay put. No more free-wheeling batteries falling out in drawers and purses. *based on high drain performance, battery sizes 1.